Reddit reviews Kokuyo Systemic Refillable Notebook Cover - Twin Ring Notebook with Edge Title - Semi B5 (7" X 9.8") - Normal Rule - 35 Lines X 40 Sheets - Black Cover

I really like the Kokuyo notebook covers, particularly the B5 cover that holds up to 4 notebooks without getting too fat. It also has card holders and a pen holder, although I seldom use that holder unless I have a cheap rugged pen on hand. The cover is made of a canvas material and holds up pretty damn well.

https://www.amazon.com/Kokuyo-Systemic-Refillable-Notebook-Cover/dp/B0049KEEHM

The notebook that comes with it is pretty awesome as well.

edit: Here's a great video on some Japanese notebook holders: https://www.youtube.com/watch?v=HG68s_bHF0Y

I forgot to add one note about the Kokuyo notebook cover: each notebook it stores is accessed easily without needing to remove any notebooks.

I'm fairly new to bujo and i just switched to multiple notebooks. Here goes... my $0.02 worth!

I started with Mnemosene 149(?) Which I think is B5 size. I loved the size a d couldn't see myself going down to A5 or smaller. I had a very hard time finding an organizing holder for multiple notebooks in that size, as A is mostly what's used in USA and Europe. I'm not thrilled with the ordinary look of this notebook, but it's a blank canvas to customize, and much sturdier than I initially thought. I may try my hand at needlepoint and add some little flowers along the top edge of the pocket. I liked this one especially with the extra fold-out 3rd section so I can hold more journals.

Kokuyo Systemic Refillable Notebook Cover - Twin Ring Notebook with Edge Title - Semi B5 (7" X 9.8") - Normal Rule - 35 Lines X 40 Sheets - Black Cove https://www.amazon.com/dp/B0049KEEHM/ref=cm_sw_r_cp_apap_rLa2leAPZmOCQ

This paper us the same company so caught our eye. I love it! It is lined with subtle little dots along the line. This way you can use it as grid or for dot paper if you want to add straight lines, but it's very subtle so not distracting when you just want lined. In my few days of using it, I have had no bleed thru of fountain pens. It is soft and smooth. It comes in multiple other varieties too.

Kokuyo Campus NotebookRegla Semi B5Dotted 7mm30hojasPack de 5, colores https://www.amazon.com/dp/B002C4KL88/ref=cm_sw_r_cp_apap_IVQSEdkgzwha7

I'm loving having multiple notebooks that all fit into one. I use them in different amounts of time so I can swap out one as I fill it without needing to waste pages from other sections. I currently have separate books for
bullet journaling (day week month)
long-term
journal/diary
creativity (sketch, ideas...)
*workbook/notes from a book I'm going thru.

Again, im pretty new to both bujo-ing and to Reddit. I hope I'm not being insulting by giving too much info.

Happy bujo-ing!